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Question 81

Which HPE Aruba Networking technology provides centralized cloud-based monitoring and configuration of supported network devices?

1. HPE Aruba Networking Central
2. ARP
3. OSPF
4. LACP

Correct Answer: 1

Explanation

HPE Aruba Networking Central provides centralized cloud-based management, monitoring, configuration, and visibility for supported Aruba networking infrastructure. It enables administrators to manage devices across multiple locations through a centralized platform and can simplify configuration consistency and operational monitoring. ARP resolves IPv4 addresses to MAC addresses, OSPF provides dynamic routing, and LACP aggregates physical interfaces. Central can also provide dashboards, alerts, reporting, and troubleshooting information, making it useful for organizations that need centralized operational control over distributed network infrastructure.

Question 82

Which protocol is commonly used to exchange routing information between routers within the same autonomous system?

1. BGP
2. OSPF
3. LLDP
4. RADIUS

Correct Answer: 2

Explanation

OSPF is an interior gateway protocol commonly used to exchange routing information within an autonomous system. It uses a link-state database to calculate paths and can dynamically adapt when network topology changes. OSPF supports areas, allowing larger networks to be organized hierarchically. BGP is primarily designed for routing between autonomous systems, LLDP discovers directly connected neighbors, and RADIUS provides authentication and accounting. OSPF is therefore a common choice for enterprise Layer 3 networks where dynamic internal route exchange and convergence are required.

Question 83

Which feature can prevent a switch port from learning an unlimited number of MAC addresses?

1. NTP
2. Port security
3. OSPF
4. VRRP

Correct Answer: 2

Explanation

Port security can restrict the number of MAC addresses that a switch interface is permitted to learn. This can help reduce the risk of MAC table exhaustion attacks and unauthorized device connections. Depending on the configuration, the switch can learn specific permitted addresses or enforce a maximum number of addresses and define an action when a violation occurs. NTP synchronizes time, OSPF provides routing, and VRRP provides gateway redundancy. Port security should be configured carefully because an overly restrictive policy may block legitimate devices from accessing the network.

Question 84

Which protocol is designed to provide secure remote access to the command-line interface of a network device?

1. FTP
2. TFTP
3. SSH
4. DHCP

Correct Answer: 3

Explanation

SSH provides secure, encrypted remote command-line access to network devices. It protects administrative credentials and session information while they travel across the network. This makes SSH preferable to insecure remote management protocols such as Telnet. FTP and TFTP are file-transfer protocols, while DHCP provides IP configuration information. Secure remote management should also include strong authentication, appropriate access restrictions, and secure credential practices. Limiting management access to authorized networks or administrative systems can further reduce the risk of unauthorized access to critical network infrastructure.

Question 85

What is the primary function of Dynamic ARP Protection?

1. To synchronize device clocks
2. To validate ARP information and help prevent ARP spoofing
3. To provide gateway redundancy
4. To aggregate Ethernet interfaces

Correct Answer: 2

Explanation

Dynamic ARP Protection helps protect a switched network against ARP spoofing by validating ARP messages against trusted IP-to-MAC binding information. DHCP snooping can provide the binding database used for this validation in appropriate configurations. If an ARP message contains information that does not match the expected binding, the switch can take action according to its configuration. NTP provides time synchronization, VRRP provides gateway redundancy, and LACP aggregates physical links. Dynamic ARP Protection is therefore an important Layer 2 security mechanism for reducing the risk of ARP-based attacks.

Question 86

Which protocol can be used to discover information about a directly connected switch or access point?

1. LLDP
2. BGP
3. NTP
4. RADIUS

Correct Answer: 1

Explanation

LLDP enables network devices to advertise information about themselves to directly connected neighbors. An Aruba CX switch can use LLDP information to identify neighboring devices, interfaces, system names, capabilities, and other available attributes. This makes LLDP useful for physical topology discovery, network documentation, and troubleshooting. BGP exchanges routing information between autonomous systems, NTP synchronizes clocks, and RADIUS supports centralized authentication. Because LLDP operates at Layer 2 and focuses on directly connected neighbors, it is particularly useful when administrators need to determine what device is attached to a specific switch interface.

Question 87

Which technology allows two Aruba CX switches to operate as a highly available pair while maintaining independent control planes?

1. STP
2. VSX
3. DHCP
4. sFlow

Correct Answer: 2

Explanation

VSX allows two Aruba CX switches to operate as a highly available pair while maintaining independent control planes. The architecture can provide redundancy and active forwarding capabilities while synchronizing appropriate state information between the peer switches. VSX commonly uses an inter-switch link and a keepalive mechanism to monitor peer health. STP provides Layer 2 loop prevention, DHCP provides IP configuration, and sFlow provides sampled traffic monitoring. VSX is particularly useful in aggregation and core designs where organizations require resilient connectivity without relying on a single physical switching device.

Question 88

Which mechanism allows an IPv6 host to automatically configure an address using information advertised by routers?

1. ARP
2. DHCPv4
3. SLAAC
4. NAT

Correct Answer: 3

Explanation

Stateless Address Autoconfiguration, or SLAAC, allows IPv6 hosts to configure addresses using prefix information received from IPv6 routers. Router advertisements provide the information necessary for the host to construct an IPv6 address without requiring a traditional DHCPv4 process. IPv6 environments can also use DHCPv6 when additional configuration or centralized address management is required. ARP is associated with IPv4 address resolution, DHCPv4 provides IPv4 configuration, and NAT performs address translation. SLAAC is an important feature of IPv6 and can simplify address configuration in appropriately designed networks.

Question 89

Which routing table principle determines that the most specific matching route is normally preferred?

1. Longest prefix match
2. Lowest MAC address
3. Highest VLAN number
4. Shortest hostname

Correct Answer: 1

Explanation

Routers use longest prefix matching when selecting a route for a destination. The route with the most specific network prefix that matches the destination is normally preferred over a less-specific route. For example, a route for a smaller subnet can be selected instead of a broader route covering the same destination range. This principle allows routing tables to contain both broad and specific routes. Administrative distance and metrics can influence route selection among routes learned through different or identical routing sources, but the destination lookup itself first considers the most specific matching prefix.

Question 90

Which feature is most useful for analyzing traffic patterns without capturing every packet on an interface?

1. VRRP
2. sFlow
3. RADIUS
4. MSTP

Correct Answer: 2

Explanation

sFlow provides sampled traffic information that can be collected and analyzed to understand network traffic patterns. It can help identify high-volume interfaces, top sources and destinations, protocol usage, and utilization trends without requiring complete packet capture. This makes sFlow useful for performance monitoring, troubleshooting, and capacity planning. VRRP provides gateway redundancy, RADIUS supports authentication and accounting, and MSTP prevents Layer 2 loops. Because sFlow uses sampling, it provides broad traffic visibility with less overhead than attempting to capture and analyze every packet traversing a large network.

Question 91

Which protocol is commonly used to provide centralized authentication for administrators logging into network devices?

1. LACP
2. RADIUS
3. OSPF
4. STP

Correct Answer: 2

Explanation

RADIUS can provide centralized authentication and authorization for administrative access to network infrastructure. Instead of maintaining separate credentials on every device, administrators can authenticate through a centralized service. This can simplify account management and help enforce consistent access policies. RADIUS can also provide accounting information depending on the deployment. LACP handles link aggregation, OSPF exchanges routing information, and STP prevents Layer 2 loops. Centralized authentication should be combined with appropriate authorization and management access restrictions so that authenticated users receive only the level of access required for their responsibilities.

Question 92

What is the primary purpose of a default route?

1. To provide a path when no more-specific route matches the destination
2. To discover neighboring devices
3. To assign MAC addresses
4. To synchronize clocks

Correct Answer: 1

Explanation

A default route provides a path for destinations that do not have a more-specific matching route in the routing table. In IPv4, the default route is represented as 0.0.0.0/0. It is commonly used to direct unknown destinations toward an upstream router, Internet gateway, or another designated next hop. The router still prefers more-specific routes when they exist. Default routes are especially common at network boundaries where internal devices need a general path toward external networks. LLDP discovers neighbors, ARP resolves local addresses, and NTP synchronizes system clocks.

Question 93

Which configuration would normally be used to connect an end-user workstation to a single VLAN?

1. Trunk port
2. Access port
3. Loopback interface
4. Routed-only interface

Correct Answer: 2

Explanation

An access port is normally configured for an endpoint that belongs to a single VLAN, such as a workstation, printer, or similar device. Frames sent toward the endpoint are generally untagged, while the switch associates the port with its configured VLAN. A trunk port is designed to carry traffic for multiple VLANs and is more commonly used between network devices. Loopback interfaces are logical interfaces, and routed-only interfaces serve Layer 3 connectivity. Correct access-port configuration helps ensure that endpoint traffic is placed into the intended network segment.

Question 94

Which technology can distribute traffic across multiple physical links in an aggregated connection?

1. LACP
2. DHCP
3. NTP
4. ARP

Correct Answer: 1

Explanation

LACP is used to establish and maintain link aggregation groups consisting of multiple physical Ethernet interfaces. Traffic can be distributed across the available member links according to the device’s load-balancing mechanism. This provides aggregate bandwidth and redundancy compared with relying on a single physical connection. DHCP provides host configuration, NTP synchronizes clocks, and ARP resolves IPv4 addresses to MAC addresses. Link aggregation is useful in environments where a single physical link cannot provide the desired resilience or aggregate capacity and where both connected devices support the required aggregation technology.

Question 95

Which protocol is commonly used to exchange routing information between different autonomous systems?

1. OSPF
2. BGP
3. STP
4. LLDP

Correct Answer: 2

Explanation

BGP is the standard protocol used to exchange routing information between autonomous systems. It supports extensive routing policies through path attributes and is fundamental to Internet routing. Organizations may also use BGP when connecting to multiple service providers or when implementing complex external routing relationships. OSPF is primarily an internal routing protocol, STP operates at Layer 2 to prevent switching loops, and LLDP discovers directly connected neighbors. BGP requires careful policy configuration because route advertisements can influence how traffic enters and leaves an organization’s network.

Question 96

Which technology helps ensure that a Layer 2 network remains free of forwarding loops when redundant links exist?

1. DHCP snooping
2. STP
3. RADIUS
4. NTP

Correct Answer: 2

Explanation

Spanning Tree Protocol prevents Layer 2 forwarding loops by calculating a loop-free logical topology. When redundant links exist, STP can place selected interfaces into a non-forwarding state while retaining the physical connection as a potential backup. This helps prevent broadcast storms, duplicate frames, and MAC table instability. DHCP snooping provides DHCP security, RADIUS supports authentication, and NTP synchronizes time. Modern Aruba CX environments may use different spanning-tree technologies depending on the design, but the fundamental purpose remains preventing Layer 2 loops while supporting network redundancy.

Question 97

Which feature can help an administrator identify the switch port to which a neighboring device is physically connected?

1. LLDP
2. BGP
3. VRRP
4. RADIUS

Correct Answer: 1

Explanation

LLDP can provide information about directly connected neighboring devices and their interfaces. By examining LLDP information on an Aruba CX switch, an administrator can often identify the remote system and determine which local interface connects to it. This is valuable when validating cabling, documenting network topology, and troubleshooting unexpected physical connections. BGP is a routing protocol, VRRP provides gateway redundancy, and RADIUS provides authentication and accounting. LLDP therefore provides a straightforward way to obtain useful physical-neighbor information directly from the switching infrastructure.

Question 98

Which security mechanism can restrict access to a wired network by requiring endpoint authentication at the switch port?

1. OSPF
2. 802.1X
3. NTP
4. LACP

Correct Answer: 2

Explanation

802.1X provides port-based access control by requiring an endpoint or user to authenticate before normal network access is granted. It is commonly integrated with a RADIUS server that performs authentication and authorization. This allows organizations to enforce identity-based access policies at the network edge. OSPF provides routing, NTP provides time synchronization, and LACP aggregates physical links. 802.1X is particularly useful in enterprise networks where administrators need to prevent unauthorized devices from obtaining normal connectivity simply by plugging into an available Ethernet port.

Question 99

Which Aruba CX feature can provide automated analytics and event detection based on switch telemetry?

1. NAE
2. VRRP
3. LACP
4. DHCP relay

Correct Answer: 1

Explanation

The Network Analytics Engine, or NAE, uses information collected from the Aruba CX switch to provide analytics and help identify operational conditions. It can assist with detecting abnormal behavior, monitoring specific conditions, and supporting troubleshooting activities. NAE can reduce dependence on manually checking multiple commands when investigating recurring or complex problems. VRRP provides gateway redundancy, LACP provides link aggregation, and DHCP relay forwards DHCP requests between subnets. NAE is therefore particularly useful for proactive monitoring and improving operational visibility within Aruba CX environments.

Question 100

Which statement best describes the purpose of DHCP relay in a routed network?

1. It forwards DHCP client requests toward a DHCP server located on another subnet
2. It converts IPv4 into IPv6
3. It provides Layer 2 loop prevention
4. It aggregates multiple Ethernet interfaces

Correct Answer: 1

Explanation

DHCP relay allows DHCP clients on one subnet to communicate with a DHCP server located on another subnet. Because DHCP discovery traffic is normally broadcast within the local network, a Layer 3 device must relay the request when the DHCP server is outside that broadcast domain. This allows organizations to use centralized DHCP servers for multiple VLANs and subnets. DHCP relay does not convert IPv4 to IPv6, prevent Layer 2 loops, or aggregate Ethernet interfaces. Correct relay configuration ensures that clients can obtain the appropriate IP addressing and other DHCP-provided network parameters.